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(No Model.)

H. B. PORTER. ELECTRICAL BELL.

No. 495,564. Patented Apr; 18. 1893.

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UNITED STATES PATENT OFFICE.

HENRY B. PORTER, OF NEW YORK, N. Y.

ELECTRICAL BELL.

SPECIFICATION forming part of Letters Patent No. 495,564, dated April 18, 1893.

Application filed October 26, 1891. Serial No. 409,821- (No model.)

To all whom it may concern.-

Be it known that I, HENRY B. PORTER, acitizen of the United States, and a resident of the city, county, and State of New York, have invented new and useful Improvements in Electric Bells, of which the following description, taken in connection with the drawings herewith accompanying, is a specification.

My invention relates to electric bells, and consists, first,in the general arrangement and construction of the several parts forming the device whereby simplicity and cheapness of construction are secured. And secondly, in the construction of the-core of the helix whereby the necessary power is obtained with a greatly reduced current or less battery power than required when constructed as heretofore.

The main object of my invention being to simplify and cheapen the cost of construction of such bells, and also to reduce the cost of the bell to the user by reason of the reduced battery force required.

Referring to the drawings :-Figure 1, represents a plan view of my improved device, showing the direction of the current from the battery through the device, in dotted lines, and,-Fig. 2, represents a side or edge View of the same.

To explain in detail,a, represents the base upon which the several parts forming the device are supported, and b is the helix, which is supported within a seat or depression in the base a as more clearly shown in Fig. 1, and is held in its said position by means of an overhanging frame 0 which is secured on the support a and projects over the helix and contacts with the outer edges of the spool of the same as shown at Z) in Fig. 1, to hold the same in position. The core of the helix proj ects at both ends of the same as shown at 5 19 (1, is the armature, which is U-shaped as shown and is pivoted between the sides of the frame 0 with its arms projecting horizontally therefrom in proximity with the projecting ends I) b of the core in position to be attracted thereto. One side. of the armature has its bearing within an opening in the side of the frame and at its opposite end in a hollow screw d supported in the side of said frame.

d is a circuit-breaker consisting of a springarm which projects from the armature at a point about central thereof and at its free end engages the end of an adjusting screw 0 supported in the upper end of the frame 0 for the purpose as will be described.

a is a post which projects from the base of the frame 0 adjacent to the circuit-breaker 61 e is a screw which is supported in said post a nd is insulated therefrom by rubber disks e e e is a washer formed of copper or other suitable conducting material placed between the outer disk and the screw or ordinary washer thereon. The inner projecting end of this screw contacts with the said spring arm or circuit-breaker (1 when the latter is in its normal position, and the function of the engagement of said spring-arm or circuit-breaker at its free end with the adjusting-screw c is to throw the armature back to its normal position after being drawn to the core b b and the circuit has been broken. Thus it will be seen that the arm (1 serves the double purpose as a circuit-breaker and a spring for returning the armature to its normal position.

f is the bell, which is supported on a post a, located, in the present instance shown, near the lower end of the supporting base a, and f is the bell-hammer, the arm f of which projects from a central point on the armature d by which latter it is carried and operated in a manner well understood by those skilled in the art.

h,and h are the ordinary binding posts located on the base a,one of which is insulated from said support by a hard rubber disk. The direction and course of the current from the battery through the conducting wires being clearly shown by dotted lines and arrow points and said operation not being of my present invention I will not describe the same a in detail herein.

The outer wall of the core of the helix, in the present instance, is formed of soft sheet metal wrapped double as shown, and the upper half, of the interior, or that portion adjacent to the contact surface for the armature, 1s formed of soft iron, and the lower half is formed of wood or other suitable non-conductits ends, said core being formed of an outer covering having an interior formed in two horizontal sections,one of soft iron or similar suitable material, and the other of Wood or other non-conducting material, substantially as described and for the purpose set forth.

2. In an electric bell, the combination with a supporting base, of a helix supported thereon and held in position by an overhanging frame, an armature pivotally supported by said frame and provided with the centrally located spring-arm d and with the bell-hammer, and the contact device supported in a post on said frame adjacent to the spring-arm (1 substantially as described and for the purpose set forth.

3. In an electric bell, the combination With the supporting base, of a single helix supported thereon, the frame 0 engaging said helix, the armature d pivotally supported by said frame 0, the spring circuit-breaker d carried by said armature, the adj usting-screw c for regulating the movement of said circuitbreaker, and the contact screw 6', arranged substantially as described and for the purpose set forth.

4. A helix having its core projecting from its ends, said core being formed of Wrapped sheet metal having an interior formed in two horizontal sections, one of soft iron, and the other of wood or other non-conducting material, substantially as described and for the purpose set forth.

HENRY B. PORTER. WVitnesses:

CHAS. F. DANE, ANNIE L. HAYES. 

